well the yuri bait pairing was made mostly because Akane can't help herself for being a Kana fangirl, Kana on the other side never gave a hint for the bait.
the incest route, ngl would have made sense, but author too much of a coward to actually talk about it, specially since we clearly got Aqua in love with Kana, so he should have shot down Ruby during the series and not make a friggin gag about him being a brocon.
I think the worst part is the after of the people around them, Kana, Akane and Taiki having shitty lives it just plain sucks, like it's showing that it has passed more time since the ending and they are still destroyed by the lost.
In the end, Akasaka maybe was salty because he pulled another serialization while doing Oshi no ko (inspired by the success of 100 gf), and although it had a really strong start it fizzled super fast and got the axe, probably why he wanted to f*ck us over too.
it feels like he hasn't really matured after doing Ib, like he got great success with Kaguya but couldn't actually enjoy it.
ffs I started reading Kaguya since it started as a monthly series, mostly because I found Ib good at the time and even when Kaguya's last part wasn't as good at least I could have faith in OnK being another chance to get better as an author, sadly I'm not sure I would try to read another work of his with the same expectation, like read a little and drop because he would try to ruin it again
he basically represents
, Akasaka really trashed his characters.